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SMB: long filenames, basename-derived share name, synthetic TOOLS share (#352)

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Negotiate NT LM 0.12 (17-word response, Capabilities=0) so Win95 switches
from CMD_SEARCH (8.3-only) to TRANS2/FIND_FIRST2. Implement info level
0x104 (FILE_BOTH_DIRECTORY_INFO) with the win9x quirks Samba carries:
honor SearchCount/MaxDataCount (VREDIR drops the session if exceeded),
4-byte-align entries and the trans2 reply param/data blocks, dir
EndOfFile=0, FileName null-terminated with the null counted in
FileNameLength, and ShortNameLength=0 (a UCS-2 ShortName in an OEM
session GPFs shell32 on the single-directory probe Explorer does when
entering a subfolder). Add TRANS2_QUERY_FS_INFO (0x105/1/2), SMB_COM_SEEK
and core SMB_COM_READ, which the redirector falls back to with no
CAP_LARGE_READX. Sanitize >0xFF / Windows-reserved chars in display names
so emoji folder names don't truncate to '<' and wedge Explorer.

The user share is now named after path.basename of the mounted folder
(LANMAN-safe, ≤12 chars, with TOOLS/IPC$ collision avoided). A second
purely-synthetic TOOLS share holds _MAPZ.BAT and README.TXT so they
don't clutter the user's directory; treeConnect routes by share name to
a TID and every path-resolving handler branches on it so TOOLS never
touches the host fs.

48 protocol tests; verified end-to-end in the emulator (browse \\HOST,
open both shares, list Downloads with 85+ mixed-name entries, navigate
subfolders, open files in Notepad).
This commit is contained in:
Felix Rieseberg
2026-04-11 12:26:54 -07:00
committed by GitHub
parent 43c025929b
commit 148f8e4874
8 changed files with 570 additions and 134 deletions
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7
src/renderer/smb/index.ts
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@@ -12,10 +12,10 @@ import * as os from "os";
import * as path from "path";
import { NetBIOSFramer, nbPositiveResponse, nbWrap } from "./netbios";
import { setupNbns } from "./nbns";
import { SmbSession } from "./server";
import { SmbSession, shareNameFor, TOOLS_SHARE } from "./server";
// SPIKE diagnostics: tee everything to a file so we can debug without DevTools
const LOG_FILE = path.join(os.tmpdir(), "windows95-smb.log");
const LOG_FILE = process.env.WIN95_SMB_LOG || path.join(os.tmpdir(), "windows95-smb.log");
try { fs.writeFileSync(LOG_FILE, `--- ${new Date().toISOString()} ---\n`); } catch {}
const origLog = console.log;
console.log = (...args: unknown[]) => {
@@ -57,7 +57,8 @@ interface V86 {
const log = (...a: unknown[]) => console.log("[smb]", ...a);
export function setupSmbShare(emulator: V86, hostPath: string) {
log(`serving ${hostPath} on \\\\HOST\\host (port 139)`);
log(`serving ${hostPath} on \\\\HOST\\${shareNameFor(hostPath)} ` +
`(+ \\\\HOST\\${TOOLS_SHARE}) port 139`);
// SPIKE diagnostic: count every ethernet frame so we know if the NIC is
// emitting anything at all (DHCP, ARP, anything). Logged on a timer so